Checking and updating Python files and images

src/Admin/FindExamplesMissingTestImages.py

src/Python.md

src/Python/Plotting/SpiderPlot.py

src/Python/RectilinearGrid/RGrid.md

src/Python/RectilinearGrid/RectilinearGrid.py

src/Python/UnstructuredGrid/UGrid.py

.../Untested/HasBugs/UnstructuredTransientVolumeRendering.md

.../Untested/HasBugs/UnstructuredTransientVolumeRendering.py

src/Python/Utilities/Animation.py

src/Python/Utilities/Screenshot.py

src/Python/Utilities/VTKWithNumpy.py

src/Python/Visualization/Camera.py

src/Python/Visualization/ClampGlyphSizes.py

src/Python/Visualization/ColorActor.py

src/Python/Visualization/CubeAxesActor.py

src/Python/Visualization/GlyphTable.py

src/Python/Visualization/HardwareSelector.py

src/Python/Visualization/InteractorStyleTrackballActor.py

src/Python/Visualization/InteractorStyleTrackballCamera.py

src/Python/Visualization/MultipleViewports.py